I went from iPad mini 4 to iPad pro 9.7 with smart keyboard cover and silicon case. I pickup my iPad 4 now and then (also have silicon case and smart cover) and it is too small and seems slow now. Sure the iPad mini 4 is more portable but I would rather have a larger screen which is easier to read since the 9.7 is portable enough. I usually am packing around my work laptop and maybe even my macbook pro if I go on a trip. I find the added volume of iPad pro 9.7 is insignificant and nothing really to worry about over a mini.